这里需要说(shuō )明(míng )的是,在我们(men )系(xì )统里(lǐ )面如果(guǒ )单(dān )独设置一个子(zǐ )域名解析,比如将主机名设(shè )置为mail,单(dān )独解(jiě )析到(dào )9,那么(me )该解析(xī )记录优先泛域名在实际使用(yòng )中(zhōng )作(zuò )用(yòng )是(shì )非常广泛的,比如实(shí )现无(wú )限二(èr )级域(yù )名功(gōng )能,提供(gòng )免费的url转发(fā ),在
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